Brazilians have cried, cursed their president and covered their faces in shame after their beloved football team's humiliating 7-1 thrashing by Germany in the World Cup semi-finals.

After the fifth goal, well before half-time, hundreds of people left their expensive seats at the stadium in the southeastern city of Belo Horizonte.

Brazilians were left stunned by the 7-1 defeat. Photo: AP

A section of the crowd chanted sexually expletive obscenities against the players and President Dilma Rousseff, who during the cup had mostly enjoyed a reprieve from protests over the record $US11 billion spent to host the tournament.

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The tears began well before the final whistle, with the third German goal in the first half causing children and adults to start bawling in the stadium and in public screenings across the nation.

As people streamed out, police reinforced security inside and around the stadium.

David Luiz is consoled by teammate Thiago Silva. Photo: Reuters

Others around the country shouted at their televisions and abandoned public screenings.

As the goals kept going in, a downpour only added to the already gloomy mood of thousands of fans in Brazil's canary-yellow jersey at the official "Fan Fest" on Rio de Janeiro's Copacabana beach.

World Cup 2014: Brazil v Germany highlights

But Jessica Santos, a 23-year-old photo student, was taking the massacre in stride.

"The cup is back in Brazil for the first time in 64 years so of course we'll cheer until the end," she said. "If Brazil wins, we party, if Brazil loses, we still party. It would have been worse to lose to Argentina in the final."

At a popular night district of Sao Paulo, fans shouted insults at goalkeeper Julio Cesar and other players.

"I was afraid we would lose because we were without Neymar and Thiago Silva. But I never thought it would be a massacre," said Alexa Rosatti, 19, a university student. "I stopped watching for a second and they already had scored a sixth goal."

At Sydney's World Cup fan park, Adriana Schroeder, a Brazilian emigrant, saw a young boy weep on screen.

"I was crying because I saw the kids suffering, I think they really believed that we could win," she said.

"The whole country is crying right now."

It only took thirty minutes for it to be over for Brazilian fans around the world as Germany raced into a 5-0 lead.

"It just got worse and worse, I was beyond shocked" said Brazilian Nathan Costa.

At half time, German fan, Linda Bixa, danced her way through a marching Brazilian samba band.

If she felt sorry for a country in tears it wasn't showing.

"I never expected it to be so easy!" she said.

As the game wore on, fewer and fewer Brazilian fans were prepared to keep watching the punishing spectacle, only a trickle remained at Sydney's fan park as the game pushed through the second half.

Other fans were already prepared to look beyond the World Cup, the crushing loss means that Brazillians can focus more on the country's economic issues, said Brazillian student Nathan Costa.

"I just hope the protests get back on track, the World Cup was a distraction with the focus on the football team," he said.